What would it take to turn a non turbo vehicle, into a turbo one?
engine
gearbox
ecu
brakes
clocks
​​​​​​​and how much of the loom would need to be changed?

 

a shed load of work and money bud. just buy a turbo car.

 

as above, simply not worth the effort in time or cost

 

I've never understood why folk want to do this, unless you plan to drive un insured as it will be a modified turbo car so dearer to insure. the work involved to do it will way out cost the price of a turbo model, its just not worth it, sell it and buy one.